Nephrite
Chemical Formula	Ca2(Mg,Fe)5Si8O22(OH)2[1]
Species	Silicates
Crystal System	Monoclinic
Mohs Scale	6-6.5
Specific Gravity	2.95
Color	Translucent to opaque and often mottled. Light to dark green, yellow to brown, white, gray, black.[1]
Luster	dull[1]
Refractive Index	1.606 - 1.632 (+.009, -.006)[1]
Fracture	splintery to granular[1]
Crystal Habit：massive